CN114744208B - Current collector etching foil, preparation method thereof, electrode and lithium battery - Google Patents

Current collector etching foil, preparation method thereof, electrode and lithium battery Download PDF

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Publication number
CN114744208B
CN114744208B CN202210341796.1A CN202210341796A CN114744208B CN 114744208 B CN114744208 B CN 114744208B CN 202210341796 A CN202210341796 A CN 202210341796A CN 114744208 B CN114744208 B CN 114744208B
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tank
metal foil
foil
current collector
pickling
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CN114744208A (en
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刘福海
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Foshan Zhongji Ximi New Material Co ltd
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Foshan Zhongji Ximi New Material Co ltd
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Priority to PCT/CN2022/118304 priority patent/WO2023184879A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/661—Metal or alloys, e.g. alloy coatings
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F1/00—Etching metallic material by chemical means
    • C23F1/10—Etching compositions
    • C23F1/14—Aqueous compositions
    • C23F1/16—Acidic compositions
    • C23F1/18—Acidic compositions for etching copper or alloys thereof
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F1/00—Etching metallic material by chemical means
    • C23F1/10—Etching compositions
    • C23F1/14—Aqueous compositions
    • C23F1/16—Acidic compositions
    • C23F1/20—Acidic compositions for etching aluminium or alloys thereof
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/10—Other heavy metals
    • C23G1/103—Other heavy metals copper or alloys of copper
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/12—Light metals
    • C23G1/125—Light metals aluminium
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
    • C23G1/20—Other heavy metals
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
    • C23G1/22—Light metals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/70—Carriers or collectors characterised by shape or form
    • H01M4/80—Porous plates, e.g. sintered carriers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Electrochemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Cell Electrode Carriers And Collectors (AREA)
  • ing And Chemical Polishing (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Abstract

The invention discloses a current collector etching foil and a preparation method thereof, an electrode and a lithium battery, wherein the preparation method of the etching metal foil comprises the steps of providing the metal foil; etching the metal foil, wherein the metal foil sequentially passes through a pickling tank, an alkaline washing tank, a pickling tank and a cleaning tank; and drying the etched metal foil. The preparation method is simple, and the etched metal foil has large specific surface area, small resistance and good adhesion with the electrode layer.

Description

Current collector etching foil, preparation method thereof, electrode and lithium battery
Technical Field
The application relates to the technical field of lithium batteries, in particular to a current collector etching foil, a preparation method thereof, an electrode and a lithium battery.
Background
As an environment-friendly lithium secondary battery, the lithium ion battery has been widely used in various electronic fields such as the 3C field and the EV field due to its characteristics of high specific energy, high specific power, long cycle life, good high and low temperature performance, and the like.
The current collector is one of indispensable components in the lithium battery, can bear active substances, and can collect and output current generated by the electrode active substances, so that the internal resistance of the lithium battery is reduced, and the coulomb efficiency, the cycle stability and the rate capability of the battery are improved. The current collector is a key material of the lithium battery, and on one hand, the current collector carries powdery active substances and on the other hand, the current collector plays a role in collecting current.
Copper foil and aluminum foil are generally used as a current collector of a lithium battery. An 'engagement' interface which is mutually crossed and filled is not easy to form between the aluminum foil with a smooth surface and electrode material particles, and a rolling oil film and a passivation film exist on the surface of the aluminum foil, so that the two-phase interfaces of the electrode material particles and a current collector are not firmly adhered, non-uniform in contact and poor in conductivity; particularly, after the electrode absorbs liquid, the expansion degree of the electrode material layer is increased, the interfacial resistance of the electrode is increased, the conductivity is reduced, and even the electrode material is pulverized or falls off, so that the performance of the battery is reduced.
Disclosure of Invention
The technical problem to be solved by the application is to provide an etched metal foil with a high specific surface area, a small resistance and a strong adhesive force and a preparation method thereof.
The technical problem to be solved by the present application is to provide a lithium battery electrode with high reliability and small interface resistance.
The technical problem that this application still needs to solve lies in, provides a lithium cell that the reliability is high, and the cycling performance is good.
In order to solve the technical problem, the application provides a preparation method of a current collector etching foil, which comprises the following steps:
providing a metal foil;
carrying out etching treatment on the metal foil, wherein the metal foil sequentially enters a pickling tank, an alkaline washing tank, a pickling tank and a cleaning tank, and pickling solution in the pickling tank comprises HF and H 2 SO 4 The alkaline washing liquid in the alkaline washing tank comprises Ca (OH) 2 And/or LiOH, wherein the cleaning tank contains deionized water, and the cleaning tank contains deionized water, wherein the HF and the H are 2 SO 4 The total mass of the acid washing solution is 4 to 6 percent of the total mass of the acid washing solution, and the Ca (OH) 2 And/or the total mass of LiOH is 4-6% of the total mass of the alkaline washing liquid;
and drying the etched metal foil.
As an improvement of the above, the HF andH 2 SO 4 the mass ratio of (1) to (2.5-5).
As an improvement of the scheme, the alkaline washing liquid in the alkaline washing tank comprises Ca (OH) 2 And LiOH, wherein the Ca (OH) 2 The mass ratio of LiOH to LiOH is 1 (3.5-6.5).
As an improvement of the above, the HF and H 2 SO 4 The mass ratio of (1), (3-4), the Ca (OH) 2 The mass ratio of LiOH to LiOH is 1 (4-5).
As an improvement of the above scheme, the method for performing etching treatment on the metal foil includes:
the coiling metal foil is discharged to a tension roller by an unreeling machine, the metal foil is sequentially conveyed to the pickling tank, the alkaline washing tank, the pickling tank and the cleaning tank through the tension roller, and the speed of the metal foil passing through the pickling tank, the alkaline washing tank, the pickling tank and the cleaning tank is 130-160 m/min.
As an improvement of the scheme, the temperature of the deionized water is 50-70 ℃.
As an improvement of the scheme, the thickness of the metal base material is 10-20 μm, and the speed of the metal base material passing through the pickling tank, the alkaline washing tank, the pickling tank and the cleaning tank is 140-150 m/min.
Correspondingly, the application provides a current collector etching foil, the current collector etching foil is prepared by the preparation method, the etching metal foil is provided with a plurality of concave holes, the depth of the concave holes is less than 10 microns, and the aperture is 5-30 microns.
Correspondingly, the application also provides an electrode of a lithium battery, which comprises the etched metal foil prepared by the preparation method.
Correspondingly, the application also provides a lithium battery which comprises the etched metal foil prepared by the preparation method.
The application has the following beneficial effects:
the etching treatment method is simple, oil stains, impurities and the like on the surface of the metal foil can be removed, the surface wetting tension of the metal foil is improved, the etching efficiency can be improved, and the etched metal foil with high specific surface area, high adhesive force and low internal resistance is obtained under the condition that the tensile strength of the metal foil is not influenced.
The application discloses sculpture metal foil material has a large amount of shrinkage pools, and the aperture range of shrinkage pool is wide, can hold the electrode material of different particle diameters, and more importantly, this shrinkage pool can hold more lithium materials, plays the effect of mending lithium.
Compare with plain noodles metal foil, the sculpture metal foil of this application exists the quality and accounts for than light, and electrode material's granule clearance grow under the same compaction density, and electrolyte liquid retention capacity, electrode material and metal foil between adhesive force and mechanical flexibility increase advantage such as. The weight of the whole battery device is reduced by the weight of the metal foil, the surface free energy of the metal foil is increased after etching and coarsening, so that the adhesive force between the electrode material and the metal foil is increased, and the transmission of ions and electrons is facilitated.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be described in further detail below.
The application provides a preparation method of a current collector etching foil, which comprises the following steps:
s1, providing a metal foil;
the thickness of the metal substrate in the present application is preferably 10 to 20 μm. In other embodiments of the present application, the thickness of the metal substrate may also be less than 10 μm or greater than 20 μm.
The metal substrate of the present application is an aluminum foil or a copper foil, but is not limited thereto. The aluminum foil is mainly used for a positive current collector because the corrosion problem of the aluminum foil at a low potential is serious, wherein the impure components of the aluminum foil can cause the point corrosion of a non-compact surface oxide film and even can generate LiAl alloy.
In order to effectively get rid of impurity, greasy dirt and oxide layer etc. on aluminium foil or the copper foil, improve the cleanliness and the surface wetting tension of mass flow body metal foil to on conducting material or battery active material attached to mass flow body metal foil, this application need wash the processing to metal substrate.
S2, etching the metal foil;
specifically, the method for etching the metal foil comprises the following steps: and the metal foil is conveyed to the pickling tank, the alkaline washing tank, the pickling tank and the cleaning tank in sequence through the tension roller, wherein the metal foil sequentially enters the pickling tank, the alkaline washing tank, the pickling tank and the cleaning tank.
The first step of acid washing mainly has the effects of removing oil stains, forming a rough structure on the surface of the metal base material, increasing the surface area of the metal base material and achieving the effect of primary etching; the main function of alkaline washing after the first step of acid washing is to remove polar substances on the metal base material and improve the surface wetting tension of the metal base material; the second non-pickling function is to etch the surface of the metal substrate to form concave holes with preset sizes, so as to further increase the surface area of the metal substrate.
According to a great deal of experiments and researches of the inventor, if the sequence of the first step of acid washing and the alkali washing step is switched, namely the metal foil sequentially passes through the alkali washing tank, the acid washing tank and the washing tank, wherein the time of the metal foil in the acid washing tank is the sum of the two acid washing times in the application, although the sequence is simply switched, the influence on the etching effect is very large, and not only the surface wetting tension of the metal substrate is influenced, but also the tensile strength, the specific surface area and the like of the metal substrate are influenced. The etching sequence of pickling, alkali washing, pickling not only can effectively improve the cleanliness and the surface wetting tension of mass flow body metal foil, does not influence its tensile strength, can also obtain the shrinkage pool of predetermineeing the size.
The pickling solution in the pickling tank and the alkaline washing solution in the alkaline washing tank consist of specific components. Specifically, the pickling solution of the present application comprises HF and H 2 SO 4 The alkaline washing liquid in the alkaline washing tank comprises Ca (OH) 2 And/or LiOH in a cleaning tank of the present application containing deionized water. Wherein, the alkaline washing liquid can only contain Ca (OH) 2 Alternatively, only LiOH may be present, or both LiOH and Ca (OH) may be present 2 。
Due to Ca (OH) 2 And LiOH is originally an alkaline cleaning substance and thus canAs a component of the alkaline wash. However, according to the studies of the applicant, it was found that the metal substrate after pickling had been subjected to treatment containing Ca (OH) 2 And/or after alkaline washing with LiOH, the electrolyte is more uniformly wetted on the metal foil, so that the growth direction and the production speed of the dendritic crystal can be influenced, the dendritic crystal is prevented from growing in the same direction, and the influence of the dendritic crystal on the performance of the lithium battery is reduced.
Preferably, the alkaline wash comprises Ca (OH) 2 And LiOH.
Because the sculpture object of this application is the metal foil, and thickness is very thin and range is very long, and the metal foil still need unreel simultaneously and the action of rolling, consequently wash the degree of difficulty big, and the concentration of this application pickling solution and alkali wash liquid will be higher than the concentration of pickling solution and the alkali wash liquid of general washing usefulness slightly, can obtain the shrinkage pool of large aperture like this. However, if the concentrations of the acid washing solution and the alkali washing solution are too high, the tensile strength of the metal foil is affected and the metal foil is perforated.
Specifically, HF and H 2 SO 4 The total mass of the acid washing solution is 4 to 6 percent of the total mass of the acid washing solution, and Ca (OH) 2 And/or the total mass of LiOH is 4-6% of the total mass of the alkaline washing liquid. Wherein, the alkaline wash comprises Ca (OH) 2 Then Ca (OH) 2 The mass of the alkaline washing liquid is 4 to 6 percent of the total mass of the alkaline washing liquid; if the alkaline washing liquid comprises LiOH, the mass of the LiOH is 4-6% of the total mass of the alkaline washing liquid; if the alkaline wash comprises Ca (OH) 2 And LiOH, then Ca (OH) 2 And the total mass of LiOH and the alkaline washing liquid is 4-6% of the total mass of the alkaline washing liquid.
In addition to the effects of the concentrations of the pickling solution and the alkali washing solution on the etching effect, tensile strength, and the like of the metal foil, HF and H in the pickling solution 2 SO 4 In alkaline wash, ca (OH) 2 The mass ratio of LiOH to LiOH also has an influence on the etching effect, tensile strength, etc. of the metal base material.
Preferably, HF and H 2 SO 4 The mass ratio of (1) to (2.5-5); ca (OH) 2 The mass ratio of LiOH to LiOH is 1 (3.5-6.5).
More preferably, HF and H 2 SO 4 The mass ratio of (1), (3-4), ca (OH) 2 And the mass of LiOHThe ratio is 1 (4-5).
In actual batch production, an unreeling machine is needed to be adopted to pay coiled metal foil to a tension roller, wherein the metal foil is sequentially conveyed to a pickling tank, an alkaline washing tank, a pickling tank and a cleaning tank through the tension roller, and the retention time of the metal foil in the pickling tank, the alkaline washing tank, the pickling tank and the cleaning tank directly influences the etching effect and the production efficiency of the metal foil. If the time for the metal foil to pass through the pickling tank, the alkaline washing tank, the pickling tank and the cleaning tank is short, the cleaning and etching time is short, and the cleaning and etching effects are poor; if the time for the metal foil to pass through the pickling tank, the alkaline washing tank, the pickling tank and the washing tank is long, the washing and etching time is long, the production efficiency is reduced, and the tensile strength and the specific surface area of the metal foil are influenced.
Correspondingly, the speed of the metal foil passing through the pickling tank, the alkaline washing tank, the pickling tank and the cleaning tank is 130-160 m/min.
Preferably, the speed of the metal foil with the thickness of 10-20 mu m passing through the pickling tank, the alkaline washing tank, the pickling tank and the cleaning tank is 140-150 m/min;
it should be noted that a first squeezing roller for squeezing out the pickling solution is arranged between the pickling tank and the alkaline washing tank, and the first squeezing roller is used for squeezing the pickling solution on the metal foil back into the pickling tank, so as to achieve the purpose of preventing the pickling solution from running off and prevent the pickling solution from entering the alkaline washing tank and influencing the alkaline washing effect of the alkaline washing tank.
In addition, a second liquid squeezing roller for squeezing out the alkaline washing liquid is arranged between the alkaline washing tank and the pickling tank, and the second liquid squeezing roller squeezes the alkaline washing liquid on the metal foil back into the alkaline washing tank so as to achieve the purpose of preventing the alkaline washing liquid from running off and prevent the alkaline washing liquid from entering the pickling tank to influence the pickling effect of the pickling tank;
furthermore, a third squeezing roller for squeezing out the pickling solution is arranged between the pickling tank and the cleaning tank, and the third squeezing roller is used for squeezing the pickling solution on the metal substrate back into the pickling tank so as to achieve the purpose of preventing the pickling solution from running off and prevent the pickling solution from entering the cleaning tank and affecting the cleaning effect of the cleaning tank.
The utility model provides a metal foil washs and the sculpture back through the descaling bath, alkali wash tank and descaling bath, and the final still needs wash through the washing tank, contains deionized water in the washing tank, and the main effect is the resolute that produces in remaining pickle and the pickling process on getting rid of the metal foil, effectively improves the cleanliness and the surface wetting tension of metal foil. If the cleaning tank is lacked, the pickling solution and the pickled decomposition products remained on the metal foil can influence the conductivity or electrochemical performance of a conductive coating or an electrode active substance subsequently coated on the aluminum foil, and further influence the service life, cycle number, electric quantity and the like of the lithium battery.
Preferably, the temperature of the deionized water is 50 to 70 ℃. More preferably, the temperature of the deionized water is 55-60 ℃.
S3, drying the etched metal foil;
it should be noted that the drying temperature of the metal foil has an important influence on the production cost, the production efficiency and the quality of the fluid etching foil, and if the drying temperature is too low, the drying time is long and the production efficiency is low; if the drying temperature is high, the energy consumption is high, the production cost is increased, the stress of the current collector etching foil is also increased, and the binding force between the current collector etching foil and the conductive coating or the active substance is influenced.
Preferably, the drying temperature of the metal foil is 130-160 ℃. Preferably, the drying temperature of the metal foil is 140-150 ℃.
Correspondingly, the application also provides a current collector etching foil which is prepared by the preparation method.
Specifically, the etched metal foil is provided with a plurality of concave holes, the depth of each concave hole is smaller than 10 micrometers, and the pore diameter is 5-30 micrometers.
It should be noted that, the etched metal foil of the present application does not form a through hole, and the etched foil of the present application forms a rough structure on the surface of the metal foil only by an etching method to increase the specific surface area and specific volume of the metal foil, thereby improving the adhesion between the current collector and the electrode material. This application sculpture foil material shrinkage pool's aperture scope is wide, and this shrinkage pool can hold the electrode material of different particle diameters, and more importantly, this shrinkage pool can hold more lithium materials, plays the effect of mending lithium.
Compare with plain noodles metal foil, the sculpture metal foil of this application exists the quality and accounts for than light, and electrode material's granule clearance grow under the same compaction density, and electrolyte liquid retention capacity, electrode material and metal foil between adhesive force and mechanical flexibility increase advantage such as. The weight of the whole battery device is reduced by the weight of the metal foil, the surface free energy of the metal foil is increased after etching and coarsening, so that the adhesive force between the electrode material and the metal foil is increased, and the transmission of ions and electrons is facilitated.
In addition, because the adhesive force between the electrode material and the etching foil is increased, the interface resistance of the electrode is reduced, the specific capacitance of the electrode is increased, and the cycle performance is improved.
Correspondingly, the application also provides a lithium battery electrode which comprises the etched metal foil.
Correspondingly, the application also provides a lithium battery which comprises the etched metal foil.
The present application will be further illustrated by the following specific examples
Example 1
A preparation method of a current collector etching foil comprises the following steps:
s1, providing an aluminum foil base material with the thickness of 12 microns;
s2, discharging the coiled aluminum foil base material to a tension roller by using an unreeling machine, and sequentially conveying the aluminum foil base material to a pickling tank, an alkaline washing tank, a pickling tank and a cleaning tank which are all 1m in length through the tension roller at a speed of 130 m/min; wherein the pickling solution in the pickling tank comprises 1.1wt% of HF and 2.9wt% 2 SO 4 The alkaline solution in the alkaline bath contained 0.8wt% Ca (OH) 2 And 3.2wt% lioh, the rinse bath containing deionized water at a temperature of 50 ℃;
and S3, drying the aluminum foil base material etched in the step S2 at the temperature of 130 ℃ at the speed of 130m/min to obtain the etched aluminum foil of the current collector.
Example 2
A preparation method of a current collector etching foil comprises the following steps:
s1, providing an aluminum foil base material with the thickness of 12 microns;
s2, discharging the coiled aluminum foil base material to a tension roller by using an unreeling machine, and sequentially conveying the aluminum foil base material to a pickling tank, an alkaline washing tank, a pickling tank and a cleaning tank which are 1m in length through the tension roller at the speed of 140 m/min; wherein the pickling solution in the pickling tank comprises 1.2wt% of HF and 3.3wt% of H 2 SO 4 The alkali wash in the alkali wash tank comprises 1wt% Ca (OH) 2 And 3.5wt.% lioh, with deionized water having a temperature of 55 ℃ in the wash tank;
and S3, drying the aluminum foil base material etched in the step S2 at 140 ℃ to obtain the current collector etched aluminum foil.
Example 3
A preparation method of a current collector etching foil comprises the following steps:
s1, providing an aluminum foil base material with the thickness of 12 microns;
s2, discharging the coiled aluminum foil base material to a tension roller by using an unreeling machine, and sequentially conveying the aluminum foil base material to a pickling tank, an alkaline washing tank, a pickling tank and a cleaning tank which are 1m in length through the tension roller at the speed of 150m/min; wherein the pickling solution in the pickling tank comprises 1.3wt% of HF and 3.7wt% of H 2 SO 4 The alkaline solution in the alkaline bath comprised 1wt% Ca (OH) 2 And 4wt% LiOH, containing deionized water at a temperature of 60 ℃ in the cleaning tank;
and S3, drying the aluminum foil base material etched in the step S2 at 150 ℃ to obtain the current collector etched aluminum foil.
Example 4
A preparation method of a current collector etching foil comprises the following steps:
s1, providing an aluminum foil base material with the thickness of 12 microns;
s2, discharging the coiled aluminum foil base material to a tension roller by using an unreeling machine, and sequentially conveying the aluminum foil base material to a pickling tank, an alkaline washing tank, a pickling tank and a cleaning tank which are 1m in length through the tension roller at the speed of 155 m/min; wherein the pickling solution in the pickling tank comprises 1.4wt% of HF and 4.1wt% of H 2 SO 4 Alkali in the alkali washing tankThe lotion contained 1.2wt% Ca (OH) 2 And 4.3wt% LiOH, containing deionized water at a temperature of 65 ℃ in the wash tank;
and S3, drying the aluminum foil base material etched in the step S2 at 150 ℃ to obtain the current collector etched aluminum foil.
Example 5
A preparation method of a current collector etching foil comprises the following steps:
s1, providing an aluminum foil base material with the thickness of 12 microns;
s2, discharging the coiled aluminum foil base material to a tension roller by using an unreeling machine, and sequentially conveying the aluminum foil base material to a pickling tank, an alkaline washing tank, a pickling tank and a cleaning tank which are all 1m in length through the tension roller at the speed of 160 m/min; wherein the pickling solution in the pickling tank comprises 1.6wt% of HF and 4.4wt% of H 2 SO 4 The alkaline solution in the alkaline bath contained 1.5wt% Ca (OH) 2 And 4.5wt.% lioh, with deionized water having a temperature of 70 ℃ in the rinse tank;
and S3, drying the aluminum foil base material etched in the step S2 at 160 ℃ to obtain the current collector etched aluminum foil.
Example 6
Different from example 3, the pickling solution in the pickling tank of example 6 contained 1.5wt% of HF and 1.5wt% of H 2 SO 4 The alkaline solution in the alkaline bath contained 1.5wt% Ca (OH) 2 And 1.5wt.% lioh.
Example 7
Different from example 3, the pickling solution in the pickling tank of example 7 comprises 0.3wt% HF and 2.7wt% H 2 SO 4 The alkaline washing liquid in the alkaline washing tank contained 0.3wt% Ca (OH) 2 And 2.7wt% lioh.
Example 8
Unlike example 3, the aluminum foil substrate of step S2 in example 8 was conveyed through a tension roller to an acid washing tank, an alkali washing tank, an acid washing tank, and a cleaning tank in this order at a speed of 180 m/min.
Example 9
Unlike example 3, the temperature of the deionized water in the cleaning tank in example 9 was 30 ℃.
Comparative example 1
A preparation method of a current collector etching foil comprises the following steps:
s1, providing an aluminum foil base material with the thickness of 12 microns;
s2, discharging the coiled aluminum foil base material to a tension roller by using an unreeling machine, and sequentially conveying the aluminum foil base material to an alkaline washing tank, a pickling tank and a cleaning tank which are all 1m in length through the tension roller at the speed of 150m/min; wherein the pickling solution in the pickling tank comprises 4wt% of 2 SO 4 The alkaline solution in the alkaline bath comprised 4wt% Ca (OH) 2 The cleaning tank contains deionized water with the temperature of 60 ℃;
and S3, drying the aluminum foil base material etched in the step S2 at 150 ℃ to obtain the etched aluminum foil of the current collector.
Comparative example 2
A preparation method of a current collector etching foil comprises the following steps:
s1, providing an aluminum foil base material with the thickness of 12 microns;
s2, discharging the coiled aluminum foil base material to a tension roller by using an unreeling machine, and sequentially conveying the aluminum foil base material to a pickling tank, an alkaline washing tank and a washing tank which are all 1m in length through the tension roller at the speed of 150m/min; wherein the pickling solution in the pickling tank comprises 3wt% of HF, the alkaline solution in the alkaline washing tank comprises 3wt% of LiOH, and the washing tank contains deionized water at 60 deg.C;
and S3, drying the aluminum foil base material etched in the step S2 at 150 ℃ to obtain the current collector etched aluminum foil.
Comparative example 3
A preparation method of a current collector etching foil comprises the following steps:
s1, providing an aluminum foil base material with the thickness of 12 microns;
s2, discharging the coiled aluminum foil base material to a tension roller by using an unreeling machine, and sequentially conveying the aluminum foil base material to a pickling tank, an alkaline washing tank and a cleaning tank which are 1m in length through the tension roller at the speed of 150m/min; wherein the pickling solution in the pickling tank comprises 2wt% of HF and 1wt% of H 2 SO 4 In alkaline washing tanksThe alkaline washing solution comprises 2wt% of Ca (OH) 2 And 2wt% LiOH, containing deionized water in the cleaning tank at a temperature of 60 ℃;
and S3, drying the aluminum foil base material etched in the step S2 at 150 ℃ to obtain the current collector etched aluminum foil.
Comparative example 4
A preparation method of a current collector etching foil comprises the following steps:
s1, providing an aluminum foil base material with the thickness of 12 microns;
s2, discharging the coiled aluminum foil base material to a tension roller by using an unreeling machine, and sequentially conveying the aluminum foil base material to a pickling tank, an alkaline washing tank, a pickling tank and a cleaning tank which are 1m in length through the tension roller at the speed of 150m/min; wherein the pickling solution in the pickling tank comprises 5wt% of 2 C 2 O 4 An alkaline wash solution in an alkaline wash tank comprising 5wt% NaOH, the wash tank containing deionized water at a temperature of 60 ℃;
and S3, drying the aluminum foil base material etched in the step S2 at 150 ℃ to obtain the current collector etched aluminum foil.
The aluminum foil substrates of examples 1 to 9 and comparative examples 1 to 4 were obtained from the same supplier and belong to the same batch. The current collector aluminum foils (experimental group 1) prepared in the aluminum foil substrate (blank group), examples 1 to 9 and comparative examples 1 to 4 were tested to form 14 test groups, each test group was tested by taking 3 samples, and the results were averaged, wherein the test items included the tensile strength, the specific surface area, and the electrical resistance, and the decrease rate of the tensile strength and the increase rate of the specific surface area of the aluminum foil were calculated, and the decrease rate of the tensile strength (%) = (tensile strength of blank group-tensile strength of aluminum foil of experimental group)/tensile strength of blank group + 100%, and the increase rate of the specific surface area (%) = (specific surface area of experimental group-specific surface area of blank group)/specific surface area of blank group + 100%;
the etched aluminum foils prepared in examples 1 to 9 and comparative examples 1 to 4 and the blank group of aluminum foil substrates were cut to the same size, and the resistance thereof was tested by a four-probe method;
the etched aluminum foils and the blank group aluminum foil substrates prepared in examples 1 to 9 and comparative examples 1 to 4 were used as electrodes, and specifically, electrode slurry consisting of 95 mass% lithium nickel cobalt manganese oxide and 5 mass% PVDF binder was applied to the etched aluminum foils and the aluminum foil substrates to form an electrode layer having a thickness of 170 μm. The electrodes of examples 1 to 9 and comparative examples 1 to 4 and the blank group were subjected to an aging test and divided into 14 groups each having 5 samples, and the results were averaged. Specifically, the electrodes were placed in an aging oven at 200 ℃ for an aging test for 96 hours, and the electrode layer of the electrode and the aluminum foil were observed and counted to calculate the electrode detachment area ratio, which is = detachment area per electrode/electrode area 100%, and the results are shown in table 1.
TABLE 1
Figure BDA0003570963990000101
As is clear from the results in table 1, the results in table 1 show that the current collectors of examples 1 to 9 of the present application have significantly increased specific surface areas of etched aluminum foils, lower tensile strength reduction rates, and lower electrical resistance, as compared to the aluminum foil base material (blank group). Compared with comparative examples 1 to 4, the etched aluminum foils of examples 1 to 9 of the present application have large specific surface areas, small electrical resistances, and strong adhesion to electrode layers.
The above disclosure is only one preferred embodiment of the present application, and certainly does not limit the scope of the present application, which is therefore intended to cover all modifications and equivalents of the claims.

Claims (10)

1. A preparation method of a current collector etching foil is characterized by comprising the following steps:
providing a metal foil;
etching the metal foil, wherein the metal foil sequentially enters a pickling tank, an alkaline washing tank, a pickling tank and a cleaning tank, and pickling solution in the pickling tank comprises HF and H 2 SO 4 The alkaline washing liquid in the alkaline washing tank comprises Ca (OH) 2 And/or LiOH, wherein the cleaning tank contains deionized water, wherein the HF and the H are 2 SO 4 The total mass of the acid washing solution is 4-6 percent of the total mass of the acid washing solution, and the Ca (OH) 2 And/or the total mass of LiOH is 4-6% of the total mass of the alkaline washing liquid;
drying the etched metal foil;
the metal foil after drying treatment is provided with a plurality of concave holes, the depth of each concave hole is less than 10 mu m, and the aperture is 5-30 mu m.
2. The method of preparing a current collector etched foil according to claim 1, wherein the HF and H are 2 SO 4 The mass ratio of (1) to (2.5) - (5).
3. The method for preparing the etched foil of the current collector as claimed in claim 1, wherein the alkaline solution in the alkaline groove comprises Ca (OH) 2 And LiOH, wherein the Ca (OH) 2 The mass ratio of LiOH to the LiOH is 1 (3.5-6.5).
4. The method of preparing a current collector etched foil according to claim 3, wherein the HF and H are 2 SO 4 The mass ratio of (1), (3) - (4), the Ca (OH) 2 And the mass ratio of LiOH to the raw material is 1 (4-5).
5. The method for preparing a current collector etching foil according to claim 1, wherein the method for performing etching treatment on the metal foil comprises the following steps:
an unreeling machine is adopted to pay coiled metal foil to a tension roller, the metal foil is conveyed to the pickling tank, the alkaline washing tank, the pickling tank and the cleaning tank in sequence through the tension roller, and the speed of the metal foil passing through the pickling tank, the alkaline washing tank, the pickling tank and the cleaning tank is 130 to 160m/min.
6. The method for preparing the etched foil of the current collector as claimed in claim 1, wherein the temperature of the deionized water is 50-70 ℃.
7. The method for preparing the etched foil of the current collector according to claim 1, wherein the thickness of the metal foil is 10 to 20 μm, and the speed of the metal foil passing through the pickling tank, the alkaline washing tank, the pickling tank and the washing tank is 140 to 150m/min.
8. A current collector etching foil, which is characterized by being prepared by the preparation method of any one of claims 1 to 7.
9. An electrode of a lithium battery, characterized by comprising the etched metal foil prepared by the preparation method of any one of claims 1 to 7.
10. A lithium battery, characterized by comprising the etched metal foil prepared by the preparation method of any one of claims 1 to 7.
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